摘要
采用2因素有重复完全随机试验,研究苜蓿、玉米和大豆3种茬口与施肥对连作大豆产量的影响。3 a的试验结果表明:苜蓿茬口上连作3 a的大豆产量都显著或极显著高于玉米和大豆茬口上相应连作年份的大豆产量;不同年份,施肥对不同作物茬口上连作大豆的产量影响效果不同;在每公顷施二铵180 kg、尿素45 kg、氯化钾45 kg(C2)肥量以下时,各茬口连作大豆产量与相应茬口不施肥处理连作大豆产量间差异不显著;即使苜蓿茬口上不施肥,其连作1、2、3 a大豆产量也高于所有玉米茬与施肥水平组合的对应年份连作大豆产量,而全部显著或极显著高于大豆茬与各施肥水平组合的对应年份连作的大豆产量。苜蓿茬上施大豆专用复合肥375 kg.hm-2组合处理大豆产量最高(2911.5 kg.hm-2),显著或极显著的比其它21个组合增产0.57%～54.42%。可见在连作大豆情况下,相对玉米和大豆茬而言,苜蓿茬起到了增产、增效、环境友好型和降低施肥成本的作用。
Effects of crop stubbles and fertilization on the yields of continuous cropping soybean were studied by completely random trial in Longzhen Farm from 2003 to 2005. The results showed that the yields of soybean continuous cropping in alfal- fa for 3 years were all significantly or very significantly higher than that of in maize and soybean; the effects of fertilization on the yields of soybean continuous cropping under different crop stubbles varied among years. The yields between soybean con- tinuous cropping fertilized with diammonium 180 kg, urea 45 kg and potassium chloride 45 kg · ha-1（C2）and that without fertilizer were no significantly different; even no fertilizer in alfalfa stubble, the yields of soybean continuous cropping on it for 3 years were higher than that of almost all combinations of maize and soybean stubble and fertilizations. The yields, 2911.5 kg· ha-1（A1C7）of soybean continuous cropping on alfalfa in 3rd year fertilized by compound fertilizer （375 kg · ha -1） was the highest, significantly or very significantly increased 6.57%- 54.42% than that of other 21 treatment combi- nations（ A2 C7 - A3 C6）. Compared the results of soybean continuous cropping in maize, soybean and alfalfa stubble, the alfalfa stubble was effective in increasing yields and decreasing fertilizer cost.
出处
《大豆科学》
CAS
CSCD
北大核心
2010年第5期830-835,共6页
Soybean Science
基金
黑龙江省科技厅"十五"资助项目(GA02B716-07-02)
关键词
大豆
连作
苜蓿茬
玉米茬
Soybean
Soybean continuous cropping
Alfalfa stubble
Maize stubble
